Re: dhcpd/tftp server subservient to another tftp server

From: Kent West (westk_at_acu.edu)
Date: 12/03/03

  • Next message: Hoyt Bailey: "Re: ..how do I tell apt-get | dpkg about bad files off a bad disk? Clue Whack, Please!" 
    Date: Tue, 02 Dec 2003 19:19:30 -0600
To: debian users <debian-user@lists.debian.org>

    Kent West wrote:

    > Kent West wrote:
    >
    >> When I boot the client pc ("bi-19x"), it gets the IP address
    >> 150.252.x.y from my dhcpd/tftp server, as indicated by the BIOS's PXE
    >> messages. But then, instead of finding the pxelinux.0 file on my
    >> dhcpd/tftp server, it finds the campus's central RIS server instead.
    >>
    >> How do I get my client to get my tftp offering instead of the RIS
    >> offering? BTW, the RIS server is on a different network segment.
    >>

    I found this info at: http://www.carotechnology.com/dbox/bootingdbox.htm

    > Start tcpdump with the parameters 'port bootps or port bootpc or port
    > nfs or port tftp'
    > this way you will see most of the stuff that will interest you.
    > Boot up your dbox and look at the tcpdump output.
    >
    > If you see and bootp answer going to 255.255.255.255 you are using the
    > wrong dhcp server!
    > Download the right one, recompile it and look for an answer going to
    > the box it self in stead of a broadcast.
    >
    >
    Then the results on my server are:
    westk[@bi-22x]:/home/westk:> sudo tcpdump port bootps
    tcpdump: listening on eth0
    19:09:35.150031 0.0.0.0.bootpc > 255.255.255.255.bootps: xid:0x6c464962
    [|bootp
    ]
    19:09:35.152879 150.252.216.1.bootps > 255.255.255.255.bootpc:
    xid:0x6c464962 f
    lags:0x8000 G:150.252.216.1 ether 0:e0:0:f7:33:78 [|bootp]
    19:09:40.195592 0.0.0.0.bootpc > 255.255.255.255.bootps: xid:0x10d9e56
    [|bootp]
    19:09:40.201482 0.0.0.0.bootpc > 255.255.255.255.bootps: xid:0x10d9e56
    [|bootp]
    19:09:46.895574 0.0.0.0.bootpc > 255.255.255.255.bootps: xid:0x4816e258
    secs:10
    24 flags:0x8000 [|bootp]
    19:09:46.896337 bi-22x.acu.edu.bootps > 255.255.255.255.bootpc:
    xid:0x4816e258
    secs:1024 flags:0x8000 Y:bi-19x.acu.edu S:bi-22x.acu.edu ether
    0:3:47:16:e2:58 [
    |bootp] [tos 0x10]
    19:09:46.898621 150.252.216.1.bootps > 255.255.255.255.bootpc:
    xid:0x4816e258 f
    lags:0x8000 Y:150.252.217.227 S:ns2.acu.edu G:150.252.216.1 ether
    0:3:47:16:e2:5
    8 [|bootp]
    19:09:46.902411 150.252.216.1.bootps > 255.255.255.255.bootpc:
    xid:0x4816e258 f
    lags:0x8000 S:150.252.135.87 G:150.252.216.1 ether 0:3:47:16:e2:58 [|bootp]
    19:09:48.872412 0.0.0.0.bootpc > 255.255.255.255.bootps: xid:0x4816e258
    secs:10
    24 flags:0x8000 [|bootp]
    19:09:48.873190 bi-22x.acu.edu.bootps > 255.255.255.255.bootpc:
    xid:0x4816e258
    secs:1024 flags:0x8000 Y:bi-19x.acu.edu S:bi-22x.acu.edu ether
    0:3:47:16:e2:58 [
    |bootp] [tos 0x10]

    10 packets received by filter
    0 packets dropped by kernel

    There is indeed a reference to 255.255.255.255; I don't understand what
    the article means when it says "If you see and bootp answer going to
    255.255.255.255 you are using the wrong dhcp server!" Does this mean
    that the Debian package dhcp3-server is the wrong package for what I'm
    trying to do? If so, what package should I be using? 

    -- 
Kent
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